參數(shù)資料
型號(hào)： EVAL-ADAU1701MINIZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/53頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL SIGMADSP AUD ADAU1701
標(biāo)準(zhǔn)包裝： 1
系列： SigmaDSP®
類型： DSP：音頻
適用于相關(guān)產(chǎn)品： ADAU1701
所含物品： 板，線纜
產(chǎn)品目錄頁(yè)面： 776 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： ADAU1701JSTZ-RL-ND - IC AUDIO PROC 2ADC/4DAC 48-LQFP
ADAU1701JSTZ-ND - IC AUDIO PROC 2ADC/4DAC 48-LQFP
其它名稱： ADAU1701MINIBZ
ADAU1701MINIBZ-ND
ADAU1701MINIZ
ADAU1701MINIZ-ND
ADAU1701
Rev. B | Page 20 of 52
AUDIO ADCs
The ADAU1701 has two Σ-Δ ADCs. The signal-to-noise ratio
(SNR) of the ADCs is 100 dB, and the THD + N is 83 dB.
The stereo audio ADCs are current input; therefore, a voltage-
to-current resistor is required on the inputs. This means that
the voltage level of the input signals to the system can be set to
any level; only the input resistors need to be scaled to provide
the proper full-scale current input. The ADC0 and ADC1 input
pins, as well as ADC_RES, have an internal 2 kΩ resistor for
ESD protection. The voltage seen directly on the ADC input
pins is the 1.5 V common mode.
The external resistor connected to ADC_RES sets the full-scale
current input of the ADCs. The full range of the ADC inputs is
100 μA rms with an external 18 kΩ resistor on ADC_RES (20 kΩ
total, because it is in series with the internal 2 kΩ). The only
reason to change the ADC_RES resistor is if a sampling rate
other than 48 kHz is used.
The voltage-to-current resistors connected to ADC0/ADC1 set
the full-scale voltage input of the ADCs. With a full-scale current
input of 100 μA rms, a 2.0 V rms signal with an external 18 kΩ
resistor (in series with the 2 kΩ internal resistor) results in an
input using the full range of the ADC. The matching of these
resistors to the ADC_RES resistor is important to the operation
of the ADCs. For these three resistors, a 1% tolerance is
recommended.
Either the ADC0 and/or ADC1 input pins can be left
unconnected if that channel of the ADC is unused.
These calculations of resistor values assume a 48 kHz sample
rate. The recommended input and current setting resistors
scale linearly with the sample rate because the ADCs have a
switched-capacitor input. The total value (2 kΩ internal plus
external resistor) of the ADC_RES resistor with sample rate
fS_NEW can be calculated as follows:
NEW
S
total
f
R
_
000
,
48
kΩ
20
×
=
The values of the resistors (internal plus external) in series with
the ADC0 and ADC1 pins can be calculated as follows:
NEW
S
Total
Input
f
Voltage
Input
rms
R
_
000
,
48
kΩ
10
)
(
×
=
Table 13 lists the external and total resistor values for common
signal input levels at a 48 kHz sampling rate. A full-scale rms
input voltage of 0.9 V is shown in the table because a full-scale
signal at this input level is equal to a full-scale output on the DACs.
Table 13. ADC Input Resistor Values
Full-Scale
RMS Input
Voltage (V)
ADC_RES
Value (kΩ)
ADC0/ADC1
Resistor
Value (kΩ)
Total ADC0/ADC1
Input Resistance
(External +
Internal) (kΩ)
0.9
18
7
9
1.0
18
8
10
2.0
18
20
Figure 17 shows a typical configuration of the ADC inputs for
a 2.0 V rms input signal for a fS of 48 kHz. The 47 μF capacitors are
used to ac-couple the signals so that the inputs are biased at 1.5 V.
ADC1
ADC0
ADC_RES
18k
47F
18k
47F
18k
ADAU1701
06
41
2-
0
17
Figure 17. Audio ADC Input Configuration
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-ADAU1701MINIZ 制造商:Analog Devices 功能描述:ADAU1701MINIZ EvaluationBoard
EVAL-ADAU1702EB 制造商:AD 制造商全稱:Analog Devices 功能描述:SigmaDSP 28-56-Bit Audio Processor with Two ADCs and Four DACs
EVAL-ADAU1702EBZ 制造商:Analog Devices 功能描述:EVALBRD SIGMADSP28/56-B AUDIOPR2ADC/4DAC - Bulk
EVAL-ADAU1761Z 功能描述:BOARD EVAL FOR ADAU1761 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:SigmaDSP® 標(biāo)準(zhǔn)包裝:1 系列:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源
EVAL-ADAU1781Z 功能描述:BOARD EVAL FOR ADAU1781 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:SigmaDSP® 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081
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